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REVENUE RECOGNITION - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Operating revenue	$ 13,748	$ 12,759
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,439	2,139
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,185	916
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	795	726
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	180	231
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 279	$ 266

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